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<meta name="description" content="Automatically start editing dropped nodes and ungroup dropped groups to create subgraphs."/> 
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<title>Graphical Macros via Auto Ungrouping</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
    <script id="code">
    function init() {
      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram =
        $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
          {
            // automatically show the state of the diagram's model on the page in a PRE element
            "ModelChanged": function(e) {
              if (e.isTransactionFinished) {
                document.getElementById("mySavedModel").textContent = myDiagram.model.toJson();
              }
            },
            "undoManager.isEnabled": true
          });

      // define the Node template for regular nodes
      myDiagram.nodeTemplateMap.add("",  // the default category
        $(go.Node, go.Panel.Auto,
          // The Node.location comes from the "loc" property of the node data,
          // converted by the Point.parse method.
          // If the Node.location is changed, it updates the "loc" property of the node data,
          // converting back using the Point.stringify method.
          new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
          // the main object is a Panel that surrounds a TextBlock with a rectangular Shape
          $(go.Shape,
            { figure: "Rectangle", fill: "white", strokeWidth: 2 },
            new go.Binding("stroke", "color"),
            { portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" }),
          $(go.TextBlock,
            {
              maxSize: new go.Size(150, NaN), textAlign: "center",
              margin: 6, editable: true, name: "TEXT",
              font: "16pt Helvetica, Arial, sans-serif"
            },
            new go.Binding("text", "text").makeTwoWay())));

      myDiagram.groupTemplate =
        $(go.Group, go.Panel.Auto,
          {
            isSubGraphExpanded: false,  // only show the Group itself, not any of its members
            ungroupable: true
          },  // allow the ExternalObjectsDropped event handler to ungroup
          // the members to be top-level parts, via a command
          $(go.Shape, "Rectangle",  // the rectangular shape around the members
            { fill: "rgba(128,128,128,0.2)", stroke: "gray", strokeWidth: 3 }),
          $(go.Placeholder, { alignment: go.Spot.TopLeft }),
          $(go.TextBlock,
            { font: "bold 16pt Helvetica, Arial, sans-serif", margin: 10 },
            new go.Binding("text", "text")));

      myDiagram.linkTemplate =
        $(go.Link,
          $(go.Shape, { strokeWidth: 1.5 }),
          $(go.Shape, { toArrow: "Standard", stroke: null }));

      // this DiagramEvent is raised when the user has drag-and-dropped something
      // from another Diagram (a Palette in this case) into this Diagram
      myDiagram.addDiagramListener("ExternalObjectsDropped", function(e) {
        // stop any ongoing text editing
        if (myDiagram.currentTool instanceof go.TextEditingTool) {
          myDiagram.currentTool.acceptText(go.TextEditingTool.LostFocus);
        }
        // expand any "macros"
        myDiagram.commandHandler.ungroupSelection();
        // start editing the first node that was dropped after ungrouping
        var tb = myDiagram.selection.first().findObject('TEXT');
        if (tb) myDiagram.commandHandler.editTextBlock(tb);
      });

      // initialize the Palette that is on the left side of the page
      myPalette =
        $(go.Palette, "myPaletteDiv",  // must name or refer to the DIV HTML element
          {
            nodeTemplateMap: myDiagram.nodeTemplateMap,
            groupTemplateMap: myDiagram.groupTemplateMap
          });

      myPalette.model = new go.GraphLinksModel([
        // a regular node
        { key: "B", text: "some block", color: "blue" },
        // a group node, plus three member nodes in that group
        { key: "G", text: "Macro", isGroup: true },
        { key: "Ga", text: "A block", color: "green", group: "G", loc: "0 0" },
        { key: "Gb", text: "B block", color: "orange", group: "G", loc: "150 25" },
        { key: "Gc", text: "C block", color: "red", group: "G", loc: "50 100" }
      ], [
          { from: "Ga", to: "Gb" },
          { from: "Ga", to: "Gc" },
          { from: "Gb", to: "Gc" }
        ]);
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div style="width: 100%; display: flex; justify-content: space-between">
    <div id="myPaletteDiv" style="width: 135px; margin-right: 2px; background-color: whitesmoke; border: solid 1px black"></div>
    <div id="myDiagramDiv" style="flex-grow: 1; height: 500px; border: solid 1px black"></div>
  </div>
  <p>
    When one drags the "Macro" node (actually a <a>Group</a>) from the Palette into the main Diagram,
    the "ExternalObjectsDropped" <a>DiagramEvent</a> listener automatically ungroups that group node
    to show all of its members nodes and links that were copied by the drag-and-drop.
  </p>
  <p>
    Note also that a drop causes the <a>TextEditingTool</a> to automatically start editing the text in the node.
  </p>
  Diagram Model saved in JSON format:
  <br />
  <pre id="mySavedModel" style="width:100%;height:300px">
  </pre>
</div>
    </div>
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